163 Race Ready Cylinder Head
The 163 casting compare closer to the 151 head than anything else, in relation to flow numbers. The 163 offers slightly more airflow in the .100 to .150 range, same at ...

$95.00

181 Race Ready Cylinder Head
The 181 casting compares close to the 151 but on the plus side, in relation to flow numbers. The 181 offers slightly more airflow in the .200 to .250 range, same at .100...